Well if you find yourself in that situation needing to have a one way conversation, than you need a new service called SlyDial. How's that for a catchy name. The service does exactly what it's name says, it allows you to dial a mobile phone number and go directly to voice mail. The phone being called may ring (depending on their cell phone provider), but you will not connect with them, they will just think they missed a call.
According to the LA Times;
Slydial is one of the many services supported by in-call commercials, a growing medium ...You can read the full article here.
... in which captive callers have to listen to an ad before they get something for free. Jingle Networks, which offers free 411 information for callers who listen to an ad first, has soared in popularity, and said last month that it had become profitable. Google offers a service called GOOG-411. The spate of ad-sponsored phone services has even angered consumer watchdogs.
The Slydial ads are about 30 seconds, but that's nothing compared with the long phone conversation you would have to have if great-aunt Millie actually picked up the phone and started asking what you think about that Obama guy. She hopefully won't pick up -- when I tried out the service earlier today, the recipient's phone rang a few times before it went straight to voicemail. Macomber said that some carriers, such as AT&T, show a missed call, and the phone might ring once or twice -- although he said even if the phone rings, the caller wouldn't be connected. Others, such as Verizon, won't ever ring.